Phase Behavior and Defect Structure of HoBaCo 2 O 6-δ.

Autor:	Yagovitin, Roman E., Tsvetkov, Dmitry S., Ivanov, Ivan L., Malyshkin, Dmitry A., Sereda, Vladimir V., Zuev, Andrey Yu.
Předmět:	DIFFERENTIAL scanning calorimetry TRANSITION temperature PARTIAL pressure PHASE transitions
Zdroj:	Inorganics; Sep2023, Vol. 11 Issue 9, p361, 12p
Abstrakt:	The differential scanning calorimetry study showed that the double perovskite HoBaCo2O6-δ (HBC), depending on its oxygen content, undergoes three phase transitions in the temperature range 298–773 K. Their origin was tentatively explained using the relevant literature data. For the single-phase tetragonal HBC, the oxygen nonstoichiometry dependences on the oxygen partial pressure were investigated by thermogravimetric and flow reactor methods in the intermediate-temperature range of 573–773 K. The proposed defect structure of HBC was successfully verified using the obtained data on its oxygen nonstoichiometry combined with those reported earlier. As a result, the values of the thermodynamic parameters ( ∆ H i ∘ , ∆ S i ∘ ) of the defect reactions proceeding in HBC were determined. The defect structure of HBC was shown to be similar to that of YBaCo2O6-δ (YBC) likely due to similar ionic radii of Ho3+ and Y3+. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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